Sound-reproducing or sound-recording machine.



G.' H. UNDERHILL .SOUNDBEPBODUOING 0R SOUND RECORDING MAOHIN APPLIOATIOHFILED JUNE 11 I Patented Apr.'18, I911.

5 SHEETS-SHEET 1.

nun

vi li lnvezui'or Gear e Undez'kz'll. 5e

G. H. UNDERHILL.

' SOUND EEPEODUGING OR SOUND RECORDING MACHINE.

APPLICATION IIIQBD JUNE 11, 1904.

Patented Apr. 18-, 1911 5 SHEETS-SHEET 2.

Inventor Geozye H. Underh ill.

Latin/43 s es G. H. UNDERHILL. SOUND REPRODUGING on souma RECORDINGMACHINE.

APPLICATION PI LBD JUNE 11, 1904.

Patented Apr. 18, 1911.

5 SHBETE-SHEET 3.

wilness es Inventor G. H. UNDERHILL. S0UND REPRODUGING 0R SOUNDRECORDING MACHINE.

APPLICATION FILED JUNE 11, 1904.

Patented Apr. 18, 1911.

6 8HEBTB-SHEET 4.

151?; ere/.1301" Lin/asses:

George Uhderhzll. Q9! flW-d M ufltt' G. H. UNDERHILL.

SOUND BEPBQDUCING 0R SOUND RECORDING MACHINE. APPLIOATION FILED JUNE 11,1904.

Patented Apr. 18, 1911.

5 SHEETS-SHEET 5.

1 STA F ornrcn.

GEORGE H. UNIDERHILL, OF BOSTON, MASSACHUSETTS.

SOUND-REPBODUCING OR SOUND-RECORDIIFG MACHINE.

Specification of Letters Patent.

Patented Apr. as, rain.

Application filed June 11, 1904. Serial No. 212,079.

1 To all whom it may concern:

. Be it known that I, Gnoncn H. Unnnnnnm, a citizen of the UnitedStates, residing at Boston, in thecounty' of Sufl'olk and State ofMassachusettahave invented an Improvement in Sound Reproducing orSound-Recording Machines, of which the following description, inconnection with the accom reference to the following description, whentaken in connection with the accompanying illustration of one specificembodiment thereof selected for illustrative purposes only; while itsscope willbe more particularly pointed out in the appended claims.

In the draWings,-Figure 1 is a side elevation of the embodiment of myinvention selected for illustration, certain of the parts being brokenaway for clearness; Fig. 2 is a detail showing in section the swivel orjointed attachment ofa' record cylinder support; Fig. 3 is a detail ofthe tilting sound box rest; Fig. 4 is a front elevation partlally brokenaway, of the machine illustrated in Fig. 1. Fig; 5 is a section,partially broken away, taken on the line 5-5 of Fig. 4, but

shown on an enlarged scale. Fig. 6 is a plan view of the machineillustrated in Fig. 1. Fig. 7 is a detail of the feed screw gearing.Fig. 8 is a side elevation, and Fig. 9, a front elevation of the detailsof the device for 10- eating and locking the record'carrier. Figs. 10and 11 are details of the feed mechanism for the sound box. Figs. 12 and.13 show the links or units of the endless record carrier respectivelyin elevation and plan. Fig. 14 shows a separate detail of the carrierlocking device. 15 is'a diagram of the electric circuits. Figs. 16 to 22show details of my improved sound box.

Referring to the drawings, although many features of my fmvention areapplicable to machines other than multiple record machines, and tomultiple record machines employing carriers widely different from thatherein illustrated, by preference I employ a flexible, endless,multiplerecord carrier in the form of two chains, composed each ofindividual units or links, a a, passing over suitable guiding means asthe sprockets, b b, and carrying between them the suitable supports, asthe rods, 0 0, upon which are secured the record supports, herein thecylin ders, al.

Referring more particularly to Figs. 1, 4,

12 and 13, each individual unit or link is composed of two parallel linkmembers, a and a provided with the washers a a and a the washers, a anda preferably acting as rolls, and washer, a*, as a rigid separating andbinding member between the two links. Elongated and preferably rigid tiemembers a extend from one chain to the other, thereby joining one linkflexibly to another and act-.

mg to maintain in fixed relative position the cprresponding units of thetwo chain carriers.

The sprockets, b b, are suitably recessed to receive and firmly seat thewashers, a a a each alternate recess being larger than the adjacent oneto receive the washer, a, which is of greater diameter than the washers,a and a Adjacent links of the chain are connected together by dovetailedjoint-s, each link ofthe chain being provided (Fig.

13) with end recesses,-a, to receive the proecting ears, a of the nextadjacent link, the adjacent links being thus pivotally secured togetherby the tie-rods, a, which pass through in each chain carrier the ends ofthe two links and the sprocket-engaging washer. The tie-rods, a, areprovided, (Fig. 4), with hexagonal or other suitably shaped heads, a, bywhich the opposite threaded 'ends thereof are screwed against shoulders,

a, bearing against the inside member of the opposite and correspondinglink. The chain links are preferably provided with lugs, a

the lug of one link resting against the back of the next adjacent linkwhen depending as shown in Fig. 1, thereby to maintain the de pendingportion of the endless carrier in a substantially vertical position.

Each link or record carrying unit is arched to substantially conform inshape with the periphery of the guiding sprocket, and, when inengagement therewith, and par ticularly when supporting its record in0perative position, receives support from its sprocket, not only throughthe washer, a, co-axial with the cylinder and on each side thereofthrough .the washers, a and a, coaxial with the tie-rods, a but alsothrough the intermediate, projecting, peripheral portionsof the sprocketwhich enter between and engage with the inner walls of the separatedhnks. The tie-rods, a, hold the corresponding links infixed relativeposition and form in effect a substantially rigid frame-work on whichthe record is supported and journaled, and this frame-work when: itsrecord is brought into operative position, by means of the effectiveinterlocking engagement of each linkwith its sprocket, gives to therecord a firm unyielding and extended lateral support 'on either side ofthe am's of' the record and at each end thereof. v The use of theflexible endless carrier described permits the utilization of anydesired number of records without varying the dimensions or alterin theproportions of the machine itself or t e mechanism required to operateit, since the chains maybe lengthened to accommodate any desired numberof record cylinders, the cylinders out of engagement with the sprocketdepending idly below the frame'ofthe machineyan additional guidin deviceas the sprocket, 5", being employe if desired, at

- the farther end of their travel.

Referring more particularly to Figs. 4 and 5, each cylinder, 05, isrigidly secured to rotate with its spindle support, 0, the latter beingsupported between the two endless carriers during its entire travel. Inorder to pfrmit a ready withdrawal of any record om its cylinder, Iprovide means temporarily for swinging one end of the cylinder away fromits carrier, the opposite end thereof having a swinging or swivelsitllpport topermit this movement. This is e ected by PI'OVldlllg uponone of the carriers the cap, (1', suitable secured to the middle orcrown of the link, a, said cap having a pocket containing thespring-pressed pin, d

the head, (1 of which enters a suitable recess in the end of thecylinder spindle, 0,. thereby to provide a journal there The . end ofthe pin, d carries an exterior thumb its piece, cl, by which the pinhead, (1 may bewithdrawn from the cylinders indle against the pressureof the spring, an that end of thecylinder thereby left free to be swungoutwardly as indicated in- Figs. 2 and 6, for

the withdrawal of the record. At the opposite end-of the spindle, c, isrigidly secured the spherical bearing, d, which restsina socket formedby the outer member of thelink, a, and theintermediate washer, af, so

I as to permit offree rotation of thespindle,

0,;within thesaid' socket,'and also permit outward movement of thecylinder member of'the chain link is suitably slotted to receive theneck of the spindle immedl ately within the ball, (i and to permit theoutward swinging of the record-carrying cylinder whenever the pin, (i iswithdrawn from the spindle recess. To reduce the hearing friction to aminimum the inner end of v the pin, (i is suitably shaped to bearagainst a ball, (i which is fixedly secured within the cup-shaped bottomof the spindle recess. Thus a record maybe removed from its support atany desired point in the travel thereof by merely detaching its supportfrom one point of attachment and swinging it about its point of swiveledattachment into a position where the record may be readily withdrawn.

rier shaft, 12, suitably journaledinthe frame of the machine, (Fig. 9),a spring, 6 or any other suitable means being employed for providing aconstant rotative effect upon the sprocket shaft, 1), to causemovementof the record carriers into and out of operative relation with therecording and reproducing .mechanism, which herein is located above themachine, the uppermost record being the one in operative position.

During recording or reproduction the cylinder, d, is rotated at uniformspeed through any suitable, and preferably, electric motor to thesleeve, 6', the latter being journaled in the frame of the machine, A.Slidable Within the sleeve, 6', is the cylinder drive shaft, e to thehead, 6 of which is secured the collar, 6*, by means'of the pin, e Theshaft, e and its head, 6 are normally spring-pressed inwardly toward therecord 'carrier, the sleeve being slotted to receive the pin, c andpermitv relative movement between the sleeve and collar, 6*, the lattermoving inwardly and outwardly with the shaft. The inner end of the shaft6 is suitably shaped to enter a corresponding recess in theend of thealining cylinder spindle, 0, suitable pro'ections, 6, upon theshaftinterlocking wit corresponding recesses in the spindle to effect themovement.

During the rotation of the cylinder and The sprockets are rigidlysecured to a car- 7 (not shown), driving the pulley, e, secured therecord carried thereby through the driving connections described, thesound box p and the finger, f (Figs. 1 and )"-secured to the yokecarrier f on the opposite side of its fulcrum support, f, is throwndownwardly to cause the sectional nut, f held at the end of said finger,to maintain engagement with the fine threaded screw, f. The latter isrotated through the gear, f, in mesh with a gear, f, the latter engagingin turn with a gear, 7'", (Fig. 5) upon the head of pulley, e, s o that,during rotation of the record cylinder said pulley, the said screw, fcauses the travel of the nut, f, and the yoke carrier, 7, with thestylus lengthwise the record cylinder. When the end ofthe desired stylustravel has beenreached, the sliding rest, P, which is preferablyprovided with a bearing tip or point of elecment with the coarserthreaded, reverse,

tricallyconductive metal, is caused to engage with two contacts, 1:,shown in diagram in Fig. 15 upon the tilting rest,- f and make anelectric circuit including, a'source of electromotive force, I),energizing the solenoid, f. The armature of the latter'is connected to alever f, to which is secured a cam, f upon which the tilting rest, f isnormally supported in the full line position shown,

Fig. 4. Energization of the solenoid f causes the withdrawal of thelever, 'f, from the full line position shown in Fig. 4 to that shown indotted lines, resulting in rais ing the tilting rest, f, and the arin, fand the consequent withdrawal of the nut G from engagement with thescrew, f, the pm or tooth, f, also carried by thefinger, f

immediately thereupon entering into engagefeeding screw, f, rotated in areverse direction' from the screw, f,'by the gears, f andf, (see Fig.7), thereby to effect the rapid return of the stylus-carrying mecha-'nism to its initial position ready for engagement with a fresh record.

I have herein also provided means simultaneously with the return of thestylus-carrying mechanism for changing or shifting the records topermitautomatically the presentation of a new record to the stylus andthe repetition of the previously described movement of the latterwith/reference to the fresh record. To this end suitable look ing.devices are provided for locking the carriers against movement duringthe outward travel of the stylus, for releasing the carriers after thecompletion of said outward travel and for again locking the carrierswhen a succeeding record has been brought into alinement with thedriving mechanism.

\Vhen the sliding rest, f makes the circuit which reverses the movementof the stylus, italso effects energization' of the solenoid, 9, (Figs. 9and 15), which operates to rock the lever, 9', about its fulcrum at, /5,the end of the lever, g, being provided with a. yoke, g, having studsengaging a-groove in the colmoves the collar, 0 to withdraw the pin, e

from the recess in the cylinder spindle, c.

The sprockets, b b, and the carriers would now be free to move under theinfluence of the spring, (F, were it not for the additional locking andlocating device, h, (Figs. 9 and 14), comprising a pin shaped similarlyto the pin, a, for entering the recess in the cylinder spindle and solocated within a pocketon the frame, A, as to engage with the cylindernext adjacent the one in operatire position. The locking or locatingpin, la, is adapted to be thrown into or out of engagement with thecylinder spindle through movement of the pivoted frame, 72., yieldablyconnected to the head of the rod l2. through the sliding and downwardlyspring pressed pin, k The head, it, of the pin, 71., contacts with a camshaped end of the arm,

72.", adapted to be rocked about its fulcrum,

h, through the link, h, connected to. the rocking lever, 9.- When thelatter is moved by the solenoid, g, to withdraw the rod, 6

- from the spindle, c, and release the same, the

lever, h, is also thrown laterally, and righthandedly as viewed in Fig.14, to rock the frame, it, about its fulcrum and throw the 'rod', 7:,backwardly out of engagement with its previously engaged spindle, thespringpressed head, h, of the pin, k yielding to permitthe cam end ofthe lever, h, to snap by the same into a position of rest.

this movement the record carriers are wholly released, and the sprocketsstart to revolve to move a fresh record into position. During thesucceeding movement, however, the locating device, it, is spring-pressedagainst theouter faces of the chain links as the latter pass before thesame, immediately snapping into'the' recess of the next spindle as thelatter comes into alinement therewith,

locating the new position of the record carriers and preventing furthermovement thereof- As soon as the solenoid, g, is deenergized by thewithdrawal of the sliding.

rest, f, from the contact pieces upon the tilting rest, the pin, e-,will alsoenter the recess of the spindle now in operative position, torotate the latter and to cooperate with the stylus when the latter hasbeen'-returned to its initial posit-ion. On the deenergization of thesolenoid, g, and the return of the spring-pressed rod, e into thespindle recess, thecam lever, 71- is also re- .turned to its normalposition as shown in Fig. 14.

It may sometimes happen under a strong rotative influenceupon thesprocket shaft, b, as tor example, when the spring, 6 is tightly woundup,th'at a considerable mov'ement of the sprockets will take place andperhaps the full movement necessary to bring a fresh record intooperative position, before the sound box and the sliding rest havetraveled far enough on reverse move- 'dle recess.

ment to break the electric circuit and deenergize the solenoid, g,thereby to free the drive shaft, 6 for rentering thenext spindevice, it,however, makes the relative movements of the carriers and the soundboximmaterial, since the pin, h, is always in position after the carriermovement has once begun, to stop such movement at the proper time.

tion the sliding rest, j", is caused to make a circuitthroughathirdsolenoid, f (Figs.

tions,-y", and, k, of the sound box. The lat-J ter isprovided with adouble set of recordessential 'to my invention as thediaphra m and otherelements of the mechanism may or ing. and-reproducing devices, and Ihave herein shown those of one set as substantially duplicated by thoseof the otherjtset;

This, it is to be understood however, is not certain purposes be widelydifferent. The

sound box consists'generally ofa double head or casing, i, and when inuse is adapt ed to be'frictiona'lly held within thesuitably 40" shapeddouble yoke,.f, already referred to.

The casing, i, -is provided with twocylindrical portions, 5 and, i thatshown in, i ,'for example (see Fig. 20), -being provided with adiaphragm, k placed between two annular rings of yieldable pack ingmaterial, such as rubber, and held against a shoulder in the casingby.means ofthe back-piece, is, screwed into the back ably axially alinedtherewith and wlth the of the casing 5', against the preferably me-.,

tallic washer, 71:. Within the tubular-portion, is, of the back-piece,70 and referdiaphragm, k, -I have provided the throat, 7:, preferablythreaded or otherwise constructed to provide adjustment thereofrelatively to the face of the diaphragm, the end of the throat adjacentthe diaphragm being suitably shaped for. the most eflicient efiect,

as by beveling the same, in the manner v press the stylus points towar,the face of the record, is, maintained upon \the two shown. j

I have found that it is not only desirable to have th'e'sound orifice-ofeach throat adjustable relatively to the diaphragm, but

The provision of the locating When the stylusreaches itsinitial posi-'reproduction. For-example I-have found' that the full'harmony of a brassband will usually be best developed throu h the em-' ployment o'f athroat havingjt e general form of that shown in Fi,gs. 20 and 21, whilethe note of 'a violin is more'-faith fully .reproduced by a diiferentlyshaped throat, as for example, that shown in section,

in Fig. 22. The provision of a plurality of such throats, eachproportioned or formed with respect to a particular quality of sound, inthe reproduction of which it is intended to be used, and replaceable oneby another,

throat in any desired relative position .to

the diaphragm, or to remove the same entirely and replace' it by anotherof difi'ere'nt shape, size or proportion. N

-The two styluses are here emplo ed, in order to provide a multipleeffect, t e' production of which, however, is obviously not limited tothe use merely of two. Each of two styluses, l and m, is connected toits respective diaphragm through the connecting body Z, m, the links,Z", and, m", and the rockshafts,'Z m so that, when in the operativeposition shown in Fig. 1 (see also 'Fig. 19),,the point of" the secondstylus is caused to trail in the same record groove as the first stylus,but directly and immediatelybehind the latter, and also arranged so thatthe vibrations communicated to'each stylus point are transmitteddirectly and efficiently to the corresponding diaphragm. The styluspoints with their rockshafts are respectively supported and movable-withthe vibratable levers, Z and m,- arranged side by side and hinged at, n,(Figs. 18 and 20) topermit the individual and relative movement of thesaid IGVGIS'tO and from the surface of the record, the'hinged support,02, being, however, itself swingmgly mounted upon the stud, 0, Fig. 18,to permit-a slight lateral movement common to each stylus movement Whensuch movement is requisite. Thus, although free vibration is permittedthe stylus points in-the reproduction of the v intended sound, they arecompelled always to track one after the other, and the lateral movementof oneno matter from what cause must be followed by alike movement oftheother.

- An equalized tension, tendin' normally to stylus points by means ofthe lever, p, fulcrumed at, p, carrying the adjustable weight, 1 thelatter acting through the bar, p, equalizing .rod, p, and pressurepoints,

32 p engaging respectively or connected with the backs of the levers, Zand m". Thus, when the sound box is adjusted relatively to the record,and the stylus point or points have found and entered the groovetherein, the force pressing the same into the groove may be varied byadjustment of the weight, 2 along the lever p; this force however, beingdistributed upon the two points by means of the equahzmg bar, 72*,

thereby to maintain an individual tension.

upon each of the cooperating stylus points, such tension beingproportioned to their individual requirements and the movement of onestylus point with its supporting lever in no way conflicting withsimultaneous movement of the other point and its lever, whethersuchmovements are similar or dissimilar. In order to relieve the diaphragmand its connections from the weight of the stylus parts, including theweight, 7F, when the sound box has been lifted or withdrawn from theface of the record, I have provided the supporting pin with acone-shaped enlarged head, 12 against which the suitably formed ends ofthe levers, m", and, n, rest when the stylus points are wlthdrawn fromthe record, but so located as to permit free vibration of the saidlevers, under the influence of the record, when the points are incontact therewith and moved under the influence of the record groovetherein. The peculiar cone shaped head, of the face, I), and thecorrespondingly formed walls upon the two levers, permit repeatedwithdrawals of the points from the record groove with "positiveassurance, however, that the points will meet the record at exactly thesame spot from which they were withdrawn, the

record and the sound box, meanwhile, having undergone no relativemovement.

I have found that the arrangement shown of multiple diaphragms, Wherethey are grouped or clustered about acommon position toward which theirvibration mechanism is directed, provides a highly efficient, and infact so far as'I'am aware the only practical, construction for obtaininga mulwithin the scope of my invention as set forth..

Claims. r 1. A multiple record phonograph having aplurality of recordsupports adapted each -to travel to bring its record into and out ofoperative relation to the machine, and means for rotating a recordplaced in operative position, said means being adapted forengagementwith or disengagement from said successive records, saidrecord supports being each individually detachable from its connectionwith the machine at one point to permit the withdrawal of its recordwhile still maintaining connection with the ma.- chine at another pointor points.

2. A multiple record phonograph having record rotating means, and aplurality of record supports, the records, carried thereby being adaptedfor successive engagement with the rotating means, the record supportsbeing individually movable about their points of attachment to themachine to permitthe removal. of their records when disengaged from thesaid rotating means.

3. A multiple record phonograph having a plurality of 'recordholdingmembers swingingly supportedupon a common car rying device.

4:. A multiple record phonograph having a linked carrier and a pluralityof record holding members swinging-1y supported upon the links thereof.

5. A multiple record phonograph having a traveling carrier, a. pluralityof record supports attached each to said carrier at a plurality ofpoints, record rotating means,

"means for moving said carrier to bring a record into operative positionand for bringing the same into engagement with said rotating means,means for disengaging the record from said rotating means and movingsaid carrier to bring afresh record into operative position, and anaxially yieldable connection at one of the points of attachment of eachrecord support to itscarrier to permit withdrawal of a record when outof operative position.

6. A multiple record phonograph having a movable record carrier forcarrying a plu rality of records, said records having each a bodymovement with the carrier, a rotary movement upon its axis, and aswinging movement about a point of attachmentto the carrier. 1

7. A sound reproducing or sound record-' 'ing machine having aswingingly mounted record support, record rotating means therefor, andmeans for clutching said rotating means to and unclutchlng the same from"said swinging support.

8. In a sound reproducing and sound recording machine, a rotaryswmgmglymounted, record-supporting spindle, record rotating means, and aclutching device adapted to interlock with the end of said spindle andconnect the same to said rotating means.

9. In a sound reproducing and sound re their supports.

cording machine, a rotary hinged record support, record rotating means,and means for connecting said rotating means to, and disconnecting thesame from the hinged end of said support.

10. In a multiple record phonograph a plurality of record supports, alinked. carrying member, said supports bemg attached each to a link ofsaid carrier by a hinged connection.

11. A multiple record phonograph having a plurality'of .linked recordcarrying members, and a plurality of record supports, said recordsupports being attached to the links of said carriers by a hingedconnection atone end and a yieldable connection at the other end.

12. A multiple record phonograph hav-' ing a plurality of recordsupports, linked carrying means therefor, and a toothed sprocket overwhich said linked carry ng means travels, said carrying means having aplurality of links adapted to engage each at its opposite ends with theteeth of said sprocket and providing an intermedlate point of attachmentfor the record support-.- 13. A multiple record phonograph having aplurality of record supports, a linked carrying member therefor, a'toothed sprocket, said carrying member 'having a plurality of linksadapted each to engage simultaneously with a plurality of sprocketteeth, and means for attaching said supports to said I V 14. A multiplerecord phonograph having a'plurality of supports, a linked carryingmember to which said supports are individually and removably attached,and a releasing member for each of'said supports movable in thedirection of the axis of the record to release said support fromthe-carrying member and its record. 7

15. A multiple record phonograph having aplurality of record supports,carrying" means therefor comprising a pair of linked marrying members.between which records are carried, and guiding means for each of saidlinked carriers, the opposite links to which said record supports areattached engaging each with said record guidlug means at their oppositeends. I

1 6. A multiple phonograph having a plu-" rahty of record supports, ca

therefor comprising a plurality of linked carriers, and means betweenthe records carried thereby connecting said carriers.

17 A multiple record phonograph having 2 a plurality .of recordsupports, carrying means therefor comprising a plurality of articulatedcarriers between which the rec- 'ord supports are carried, and means topermit individual removal of the records from permit the removal ofmeans recording machineemploying a plurality of records, the combinationof flexible record carrying means supporting said records at each endthereof and means for permitting withdrawal of an individual record. 1

19. A multiple-record machine of the class described having carrierguiding means, and flexible record-carrying means the individualrecord-carrying units of which are in interlocking engagement withcarrier guid-,

ing means at a plurality of points.

20. A multiplerecord machine of the class described having flexiblecarrier-means,com-

prising cooperating carrier-members to e which the records are journaledand by which they are caused to travel to and from their operativepositions, and stifi'ening means between said members and intermetion,an extended rigid lateral support on either side of the axis thereof.

23. A sound-reproducing or sound-recording device having flexiblerecord-carrying means employing an arched carry'ingunit.

24. In anapparatus of the class described employing a plurality ofrecords, the combination with electromotive devices andmeans'automatically to act upon said electromotive devices on the completionof one recordto bring a succeeding record into operative position.

25, In an apparatus of the class described employing a plurality ofrecords, the combination with means automatically to advance the recordsone by one to playing position, electromotive devices, and meansautomatically to act upon said electromotive devices to cause therestoration of the recording and reproducing mechanism to its initialposition on completion of its travel throughout a record.

26. In an apparatus of the class" described, the combination with aplurality of records of electrically controlled recordchanging meanstherefor.

27. In an apparatus of the 'class' described, the combination with aplurality 9f records, means for' automatically advancing sa d records topresent them one by one to the sound reproducing mechanism, and elec-'tr ca-lly controlled means forreturning the reproducing or recordingmechanism to'its initial position; T

- 28. an apparatus of the class described employmg a pluralityof recordsthecombt nation with means for presentin the records in succession tothe sound repro ucmg mechamsm, means for restorlng the reproduc ngmechanism to its initial position on completion of its travel throughouta record, of electromotive devices for actuating said means, and circuitchanging means carried by the reproducing mechanism for setting inoperation said electromotive devices.

29. In an apparatus of the class described employing a plurality ofsound records, means automatically to bring the records into and out ofoperative position, means automatically to restore the reproducingmechanism to its initial position upon each 15 change of record, andelectrical contact means carried by the reproducing mechanism forsetting in operation sald record changing means.

In testimony whereof, I have signed my 20 name to this specification, inthe presence of two subscribin witnesses.

GE RGE H. UNDERHILL.

Witnesses:

RALPH G. POWELL, HORACE A. CROSSMAN.

